Reflective Electrode Display Layout With Rear Pads for Narrow Bezels

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Solution Overview

Problem

Existing display devices face challenges in reducing the non-display area and preventing damage to the base layer due to the placement of pads and circuit elements.

Innovation Solution

The display device incorporates a reflective conductive material in the first and second electrodes, with pads formed on the circuit layer opposite to the image display surface, eliminating the need for via holes through the base layer and reducing the non-display area.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Area of stationary object

If pads and circuit elements are placed on the front surface (image display surface), then electrical connections are achieved, but the non-display area increases and base layer damage risk increases

Engineering Contradiction:

Improvenon-display areaVSAvoidbase layer integrity

Core Design Contradiction:

Area of stationary objectVSReliability

Solution Approach 1:

The pads are relocated from the front surface (2nd surface) to the back surface (1st surface) of the display device, utilizing the third dimension (depth/thickness) to resolve the spatial conflict. This allows electrical connections to be maintained while eliminating the need for via holes through the base layer, thus reducing non-display area and preventing base layer damage.

Inventive Principle:

Principle #17Another dimension (Dimensionality change)

Solution Approach 2:

Instead of placing pads on the conventional front surface where they would be visible and require base layer penetration, the invention inverts the placement to the back surface. This inversion allows the pads to connect to circuit elements through the light emitting element layer without penetrating the base layer, solving both the non-display area and base layer integrity issues.

Inventive Principle:

Principle #13The other way round (Inversion)

2Ease of operation

If via holes are created through the base layer for pad connections, then electrical connectivity is achieved, but the base layer structural integrity is compromised

Engineering Contradiction:

Improveelectrical connectivityVSAvoidbase layer strength

Core Design Contradiction:

Ease of operationVSStrength

Solution Approach 1:

The invention extracts the pads from the front surface and relocates them to the back surface, eliminating the need for via holes through the base layer. This extraction removes the harmful action of base layer penetration while maintaining electrical connectivity through alternative routing through the light emitting element layer.

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

The light emitting element layer serves as an intermediary medium for electrical connections. Instead of creating direct through-holes in the base layer, the electrical connections are routed through this intermediate layer, which is more flexible and less critical for structural integrity.

Inventive Principle:

Principle #24Intermediary (Mediator)

3Use of energy by moving object

If reflective conductive material is used in electrodes, then light extraction efficiency improves, but manufacturing complexity increases

Engineering Contradiction:

Improvelight extraction efficiencyVSAvoidmanufacturing complexity

Core Design Contradiction:

Use of energy by moving objectVSEase of manufacture

Solution Approach 1:

The first and second electrodes serve dual functions: they provide electrical connections to the light emitting element and simultaneously act as reflective surfaces to extract light. By making the electrodes multi-functional, the invention achieves improved light extraction without adding separate reflective components, thus avoiding increased manufacturing complexity.

Inventive Principle:

Principle #6Universality (Multi-functionality)

Solution Approach 2:

The invention merges the electrical conduction function and the light reflection function into a single component (the electrodes). By combining these two functions into one element, the design simplifies the overall structure and manufacturing process while achieving both electrical connectivity and enhanced light extraction efficiency.

Inventive Principle:

Principle #5Merging (Combining)

Applied Scientific Principles

This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.

Function Achieved in This Case

This configuration minimizes damage to the base layer and reduces the non-display area, enabling seamless tiling displays by connecting pads without penetrating the base layer, thus enhancing the structural integrity and aesthetic appeal.

Implementation Method 1

the first electrode and the second electrode may include a reflective conductive material

Methodology Applied

Scientific EffectReflection: Reflection

Data Source

PatentUS12563880B2Display device including the same a pixel including a first electrode and a second electrode including a reflective conductive material

Publication Date: 2026.02.24 SAMSUNG DISPLAY CO LTD

AI summary

A display device includes a base layer, a color filter layer on the base layer and including a color filter located at an emission area, a light emitting element layer on the color filter layer and including a light emitting element located at the emission area, a first electrode on a first end of the light emitting element, and a second electrode on a second end of the light emitting element, a circuit layer on the light emitting element layer and including circuit elements and lines connected to the first electrode and the second electrode, and pads on the circuit layer and connected to the lines, and the first electrode and the second electrode may include a reflective conductive material.